Your glutes could be developing, just might be foreshadowed by excess fat. Like said above, any compound leg movement (most multi-joint exercises) will indirectly or directly hit the glutes. Deepening squats will induce more of a stretch.
Deadlifts are primarily a glute, hip and hamstring movements (romanian or stiff) depending on torso angling. Lunges, GHR's, Squats, etc. are/will recruit the glutes.
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